I don´t think it referres to Shephard either but just so you know. Valve had planed op-force and blue shift during the development of the HL.
"PHL: How much of Half-Life 2 did you have in mind when you were writing the story for Half-Life? Has the story evolved much during development...
Would be cool to see a bullsquid charge at you through the water (have read somewhere that it is originaly a watercreature.. Not sure though) only to get eaten by stor gäddan (ichisisisaur) just seconds before it reach you..
The ichisisisisaur or whatever its called would be awesome! Fighting it from a sinking boat or something like that out on the sea would be like a dream coming true.. ;)
The Team Fortress Classic sniper rifle. Thats the way a sniper should be. Find a good position and just wait for the target. Btw! Haunted must be one of the best sniping maps of al time.